The 4th Torneo Abierto Legislatura 2011 Norberto La Porta took place from 29th November to 7th December at the Club Argentino de Ajedrez, Paraguay 1858, Capital Federal. 123 players competed in the main 2000+ group. The tournament was played over nine rounds of Swiss system.

GM Diego Flores defeated GM Ruben Felgaer in the last round and took a clear first place with 7.5 points. GM Salvador Alonso and FM Leandro Krysa share the second place with 7 points each. Krysa was on the verge on winning the GM norm, but he will have to console himself with an IM norm.

GM Damian Lemos could not maintain the good shape after winning the 1st Abierto Internacional Ciudad de Bahia Blanca 2011, which was held on 25-28th November. Here Lemos finished 13th with 6 points.